/**
* Copyright (C) 2009-2013 FoundationDB, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.foundationdb.sql.optimizer.plan;
import com.foundationdb.server.types.TInstance;
import com.foundationdb.server.types.TPreptimeValue;
import java.util.List;
/** An list of expressions making up new rows. */
public class Project extends BasePlanWithInput implements ColumnSource, TypedPlan
{
private List<ExpressionNode> fields;
public Project(PlanNode input, List<ExpressionNode> fields) {
super(input);
this.fields = fields;
}
public List<ExpressionNode> getFields() {
return fields;
}
@Override
public String getName() {
return "PROJECT";
}
@Override
public boolean accept(PlanVisitor v) {
if (v.visitEnter(this)) {
if (getInput().accept(v)) {
if (v instanceof ExpressionRewriteVisitor) {
for (int i = 0; i < fields.size(); i++) {
fields.set(i, fields.get(i).accept((ExpressionRewriteVisitor)v));
}
}
else if (v instanceof ExpressionVisitor) {
for (ExpressionNode field : fields) {
if (!field.accept((ExpressionVisitor)v))
break;
}
}
}
}
return v.visitLeave(this);
}
@Override
public String summaryString() {
return super.summaryString() + fields;
}
@Override
protected void deepCopy(DuplicateMap map) {
super.deepCopy(map);
fields = duplicateList(fields, map);
}
@Override
public int nFields() {
return fields.size();
}
@Override
public TInstance getTypeAt(int index) {
ExpressionNode field = fields.get(index);
TPreptimeValue tpv = field.getPreptimeValue();
return tpv.type();
}
@Override
public void setTypeAt(int index, TPreptimeValue value) {
fields.get(index).setPreptimeValue(value);
}
}